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                            ```
.flex {
    display: flex;
    display: -webkit-flex;
    /*webkit內核的瀏覽器，必需加上-webkit前綴*/
    flex-wrap: wrap;
    /* justify-content: space-between; */
    /*兩端對齊（元素之間距離相等）*/
    width: 1200px;
    /* border: 1px solid #999;  */
    margin: 0 auto;
}

.flex-item {
    width: 290px;
    /* height: 300px; */
    border: 1px solid #e6e4e4;
    margin: 0px 0px 10px 0px;
    background: #fff;
    margin-right:13px; 
}

/*這里是選第4個和第8個*/
.flex-item:nth-child(4),.flex-item:nth-child(8){
    margin-right: 0; 
 }
```
```
<div class="flex">
  <div class="flex-item">1</div>
  <div class="flex-item">2</div>
  <div class="flex-item">3</div>
  <div class="flex-item">4</div>
</div>
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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